Serverspec Rakefile creating tasks from Ansible inventory with status

Rakefile

require 'rake'
require 'rspec/core/rake_task'

# Sample of Ansible groups and hosts
# http://docs.ansible.com/ansible/intro_inventory.html
groups = {}
groups["webservers"] = [ "foo.example.com", "bar.example.com" ]
groups["dbservers"]  = [ "one.example.com", "two.example.com", "three.example.com" ]

task :spec    => 'spec:all'
task :default => :spec

namespace :spec do
  task :all     => groups.keys.map {|group| 'spec:' + group }
  task :default => :all

  # Tasks for groups
  groups.keys.each do |group|
    task group.to_sym => groups[group].map {|host| 'spec:' + group + ':' + host }

    groups[group].each do |host|
      desc "Run tests for group '#{group}'"
      task_name = group + ':' + host
      RSpec::Core::RakeTask.new(task_name) do |t|
        ENV['TARGET_HOST'] = host
        status = ENV['status'] ? ENV['status'] : 'running'
        t.pattern = "spec/#{group}/#{status}/*_spec.rb"
      end
    end
  end

  # Tasks for hosts without groups
  groups.values.flatten.uniq.each do |host|
    desc "Run tests for host '#{host}'"
    RSpec::Core::RakeTask.new(host) do |t|
      ENV['TARGET_HOST'] = host
      status = ENV['status'] ? ENV['status'] : 'running'
      t.pattern = "spec/hosts/#{host}/#{status}/*_spec.rb"
    end
  end
end